package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.128:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
        //2.消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
        consumer.subscribe(Collections.singletonList("heima-stream-result1"));

        //当前线程一直处于监听状态
        //while (true) {
        //    //4.获取消息
        //    ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
        //    for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
        //        System.out.println(consumerRecord.key());
        //        System.out.println(consumerRecord.value());
        //        System.out.println(consumerRecord.partition());//分区
        //        consumer.commitAsync((map, e) -> {
        //            if(e!=null){
        //                System.out.println("记录错误的提交偏移量："+ map+",异常信息"+e);
        //            }
        //        });
        //    }
        //}


try {
    while (true) {
        ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
        for (ConsumerRecord<String, String> record : records) {
            System.out.println(record.value());
            System.out.println(record.key());
        }
        consumer.commitAsync();
    }
} catch (Exception e) {
    e.printStackTrace();
    System.out.println("错误信息：" + e);
} finally {
    try {
        consumer.commitSync();
    } finally {
        consumer.close();
    }
}

    }

}